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INTRODUCTION. XIX
dentistry, and should in no case be confounded with the nomen-
clature of comparative dental anatomy, nor the one used in the
place of the other, nor should any effort be made to harmonize
them. When the human teeth are under consideration from the
comparative anatomy standpoint, the nomenclature of compara-
tive anatomy, which is suited to the description of the teeth of
animals in general, should be used. In that nomenclature we do
not speak of buccal and lingual surfaces of teeth but of inner
and outer surfaces, the bicuspids in dental nomenclature become
premolars in comparative dental anatomy. While there are
points of coincidence in these nomenclatures, there are wide
differences that could not be reconciled without positive injury
to both.